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One of the most recent par­a­digms that we’ve used to try to get this under exper­i­men­tal con­trol is to ask peo­ple to act out pre­tend harm­ful actions. So for instance, we’ll give them a dis­abled hand­gun. We’ll show them that it’s fake. That it couldn’t pos­si­bly harm a fly. We put it in their hands and then we ask them to shoot us in the head.

Why do we do the things that we do? Why do we some­times choose to be lov­ing par­ents and oth­er times engage in irra­tional self‐destructive behav­iors? What dri­ves us to some­times be altru­is­tic and oth­er times make deci­sions that real­ly threat­en our very sur­vival? Well, the answer lies in our brains. Our brains evolved to ensure that we repeat behav­iors that will lead to our sur­vival.

The face is a con­stant flow of facial expres­sions. We react and emote to exter­nal stim­uli all the time. And it is exact­ly this flow of expres­sions that is the observ­able win­dow to our inner self. Our emo­tions, our inten­tions, atti­tudes, moods. Why is this impor­tant? Because we can use it in a very wide vari­ety of appli­ca­tions.